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Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2023
Financial Instruments |
Summary of assets and liabilities measured fair value on a recurring basis | Below is a summary of assets and liabilities measured at fair value on a recurring basis (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of March 31, 2023
​ | ​ | Quoted | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Prices | ​ | Significant | ​ | Significant | ​ | ​
​ | ​ | in Active | ​ | Observable | ​ | Unobservable | ​ | ​
​ | ​ | Markets | ​ | Inputs | ​ | Inputs | ​ | ​
​ |  | (Level 1) |  | (Level 2) |  | (Level 3) |  | Total
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash equivalents: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money market funds | ​ | $ | 1,715 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,715
Reverse repurchase agreements | ​ | ​ | — | ​ | ​ | 69,000 | ​ | ​ | — | ​ | ​ | 69,000
Treasury bills | ​ | ​ | 6,973 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 6,973
Short-term investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate debt securities | ​ | ​ | — | ​ | ​ | 6,075 | ​ | ​ | — | ​ | ​ | 6,075
Treasury bills | ​ | ​ | 4,952 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,952
Total | ​ | $ | 13,640 | ​ | $ | 75,075 | ​ | $ | — | ​ | $ | 88,715
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, 2022
​ | ​ | Quoted | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Prices | ​ | Significant | ​ | Significant | ​ | ​
​ | ​ | in Active | ​ | Observable | ​ | Unobservable | ​ | ​
​ | ​ | Markets | ​ | Inputs | ​ | Inputs | ​ | ​
​ |  | (Level 1) |  | (Level 2) |  | (Level 3) |  | Total
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash and cash equivalents: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money market funds | ​ | $ | 1,944 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,944
Short term investments | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate debt securities | ​ | ​ | — | ​ | ​ | 16,445 | ​ | ​ | — | ​ | ​ | 16,445
Yankee securities | ​ | ​ | — | ​ | ​ | 1,999 | ​ | ​ | — | ​ | ​ | 1,999
Bonds | ​ | ​ | — | ​ | ​ | 2,988 | ​ | ​ | — | ​ | ​ | 2,988
Treasury bills | ​ | ​ | 5,980 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,980
Reverse repurchase agreements | ​ | ​ | — | ​ | ​ | 178,500 | ​ | ​ | — | ​ | ​ | 178,500
Total | ​ | $ | 7,924 | ​ | $ | 199,932 | ​ | $ | — | ​ | $ | 207,856
​

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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